- Agustín, Antonio, 1517-1586. Dialogos de medallas inscriciones y otras antiguedades1
- Alba, Fernando Alvarez de Toledo, duque de, 1507-15821
- Alchemy--Manuscripts1
- Ambassadors1
- Ana, Queen, consort of Philip II, King of Spain, 1549-15801
- Animals1
- Annibale, di Capua, approximately 1544-15951
- Annotations3
- Anti-Catholicism1
- Arabic poetry1
- Arithmetic1
- Asceticism1
- Astrology1
- Audiore, Antonio1
- Augustine, of Hippo, Saint, 354-4301
- Aurispa, Giovanni, approximately 1376-14591
- Austria2
- Autos-da-fé1
- Basil, Saint, Bishop of Caesarea, approximately 329-3791
- Bateman family1